const String ncx = "application/x-dtbncx+xml";
const String html = "text/html";
const String xhtml = "application/xhtml+xml";
const String jpeg = "image/jpeg";
const String gif = "image/gif";
const String png = "image/png";
const String bmp = "image/bmp";
const String webp = "image/webp";
const String oebps = "application/oebps-package+xml";
const String epub = "application/epub+zip";
const String css = "text/css";
const String ttf = "font/ttf";
